Ultrasound Units

An ultrasound unit is a noninvasive medical device used to produce images of body tissues and organs from differential reflections of ultrasonic sound waves. The technique of diagnostic imaging performed by ultrasound units is called ultrasonography.
Ultrasonic waves are sound waves of a higher frequency than the human ear can detect. The frequency of a sound wave is the number of times per second that it cycles, and the number of cycles is measured in hertz (Hz).
Ultrasound images are generally produced using sound waves in the range between 1.6 to 10 million megahertz (MHz). Body tissues of different density reflect, or echo, sound waves differently, allowing the sonographer to distinguish between the structures. An ultrasound unit includes a television monitor (cathode ray tube or CRT), a transducer for sending and receiving the ultrasonic waves, a transmitter, receiver, amplifier, and a strip chart recorder.
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